mirror of
https://github.com/KhronosGroup/SPIRV-Tools
synced 2024-11-30 15:00:06 +00:00
2ff54e34ed
Fixes #2451 * Structured cfg analysis now handles functions with no basic blocks * Added a test
131 lines
3.8 KiB
C++
131 lines
3.8 KiB
C++
// Copyright (c) 2018 Google LLC.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
#include "source/opt/struct_cfg_analysis.h"
|
|
|
|
#include "source/opt/ir_context.h"
|
|
|
|
namespace {
|
|
const uint32_t kMergeNodeIndex = 0;
|
|
const uint32_t kContinueNodeIndex = 1;
|
|
} // namespace
|
|
|
|
namespace spvtools {
|
|
namespace opt {
|
|
|
|
StructuredCFGAnalysis::StructuredCFGAnalysis(IRContext* ctx) : context_(ctx) {
|
|
// If this is not a shader, there are no merge instructions, and not
|
|
// structured CFG to analyze.
|
|
if (!context_->get_feature_mgr()->HasCapability(SpvCapabilityShader)) {
|
|
return;
|
|
}
|
|
|
|
for (auto& func : *context_->module()) {
|
|
AddBlocksInFunction(&func);
|
|
}
|
|
}
|
|
|
|
void StructuredCFGAnalysis::AddBlocksInFunction(Function* func) {
|
|
if (func->begin() == func->end()) return;
|
|
|
|
std::list<BasicBlock*> order;
|
|
context_->cfg()->ComputeStructuredOrder(func, &*func->begin(), &order);
|
|
|
|
struct TraversalInfo {
|
|
ConstructInfo cinfo;
|
|
uint32_t merge_node;
|
|
};
|
|
|
|
// Set up a stack to keep track of currently active constructs.
|
|
std::vector<TraversalInfo> state;
|
|
state.emplace_back();
|
|
state[0].cinfo.containing_construct = 0;
|
|
state[0].cinfo.containing_loop = 0;
|
|
state[0].merge_node = 0;
|
|
|
|
for (BasicBlock* block : order) {
|
|
if (context_->cfg()->IsPseudoEntryBlock(block) ||
|
|
context_->cfg()->IsPseudoExitBlock(block)) {
|
|
continue;
|
|
}
|
|
|
|
if (block->id() == state.back().merge_node) {
|
|
state.pop_back();
|
|
}
|
|
|
|
bb_to_construct_.emplace(std::make_pair(block->id(), state.back().cinfo));
|
|
|
|
if (Instruction* merge_inst = block->GetMergeInst()) {
|
|
TraversalInfo new_state;
|
|
new_state.merge_node =
|
|
merge_inst->GetSingleWordInOperand(kMergeNodeIndex);
|
|
new_state.cinfo.containing_construct = block->id();
|
|
|
|
if (merge_inst->opcode() == SpvOpLoopMerge) {
|
|
new_state.cinfo.containing_loop = block->id();
|
|
} else {
|
|
new_state.cinfo.containing_loop = state.back().cinfo.containing_loop;
|
|
}
|
|
|
|
state.emplace_back(new_state);
|
|
merge_blocks_.Set(new_state.merge_node);
|
|
}
|
|
}
|
|
}
|
|
|
|
uint32_t StructuredCFGAnalysis::MergeBlock(uint32_t bb_id) {
|
|
uint32_t header_id = ContainingConstruct(bb_id);
|
|
if (header_id == 0) {
|
|
return 0;
|
|
}
|
|
|
|
BasicBlock* header = context_->cfg()->block(header_id);
|
|
Instruction* merge_inst = header->GetMergeInst();
|
|
return merge_inst->GetSingleWordInOperand(kMergeNodeIndex);
|
|
}
|
|
|
|
uint32_t StructuredCFGAnalysis::LoopMergeBlock(uint32_t bb_id) {
|
|
uint32_t header_id = ContainingLoop(bb_id);
|
|
if (header_id == 0) {
|
|
return 0;
|
|
}
|
|
|
|
BasicBlock* header = context_->cfg()->block(header_id);
|
|
Instruction* merge_inst = header->GetMergeInst();
|
|
return merge_inst->GetSingleWordInOperand(kMergeNodeIndex);
|
|
}
|
|
|
|
uint32_t StructuredCFGAnalysis::LoopContinueBlock(uint32_t bb_id) {
|
|
uint32_t header_id = ContainingLoop(bb_id);
|
|
if (header_id == 0) {
|
|
return 0;
|
|
}
|
|
|
|
BasicBlock* header = context_->cfg()->block(header_id);
|
|
Instruction* merge_inst = header->GetMergeInst();
|
|
return merge_inst->GetSingleWordInOperand(kContinueNodeIndex);
|
|
}
|
|
|
|
bool StructuredCFGAnalysis::IsContinueBlock(uint32_t bb_id) {
|
|
assert(bb_id != 0);
|
|
return LoopContinueBlock(bb_id) == bb_id;
|
|
}
|
|
|
|
bool StructuredCFGAnalysis::IsMergeBlock(uint32_t bb_id) {
|
|
return merge_blocks_.Get(bb_id);
|
|
}
|
|
|
|
} // namespace opt
|
|
} // namespace spvtools
|